Grinding device for blades.



R. WOLF & A. P. BANNISTER. GRINDING DEVICE FOR BLADES. I

APPLIOATION FILED NOV. 27, 1909. 4 59 Patented July 19, 1910.

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R. WOLF & A. F. BANN ISTER. GRINDING DEVICE FOR BLADES. APPLICATION FILED NOV. 27, 1909.

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RUDOLF WOLF AND ALFRED F. BANNISTER, OF NEWARK, NEW JERSEY.

GRINDING DEVICE FOR BLADES.

To all whom it may concern:

Be it known that we, RUDOLF W'oLr and ALFRED F. BANNISTER, citizens of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Grinding Devices for Blades; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to figures of reference marked thereon, which form a part of this specification.

This invention relates to a grinding machine for grinding the blades of cutlery, and grinding them with the face of a grinding Wheel, at the same time giving the blade a rocking motion to simulate the motion given to the blade by the hand when hand grinding is done. This rocking motion to the blade is necessary to give the rounded edge to the blade, instead of the straight cut, which would be the case if the blade were held rigid against the stone or wheel.

The machine is designed to provide means for grinding the blade toward its edge and at the same time pulling it along the face of the wheel or stone so that the grinding proceeds toward the point of the blade, and the blade is held parallel to the surface of the grinding wheel, if desired, to give the same thickness of blade for the whole length of the blade. o provide, however, a means for adjusting the holding means of the blade so that the blade can be turned, as the grinding nears its point, so that the point can be tapered or thinned, which is desirable in some blades.

The machine embodies a means for automatically releasing the blade from the grinding stone or wheel when the grinding is completed, and also provides means for automatically stopping the carriage which conveys the blade when the grinding ceases and when the blade has been removed from con tact with the grinding wheel.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a front View of the grinding wheel and the carriage for conveying the blade across the face of the wheel. Fig. 2 is a top View of Fig. 1. Fig. 3 is a side view of Fig. 1, and Fig. 4 is a section taken on line 4, 4, in Fig. 2. Fig. 5 is a side View Specification of Letters Patent.

Application filed November 27, 1909.

Patented July 19, 1910.

Serial No. 530,270.

of the complete machine illustrating a mechanical means for operating the same. Fig. 6 is a top view showing, in a diagrammatic way, the turning of the blade to make a tapered point. Fig. 7 is a similar view showing the blade removed from the grinding wheel automatically. Fig. 8 is a view of a blade made with a tapered point, and Fig. 9 shows an edge view of a blade ground parallel on its two faces for its entire length. Fig. 10 is a side view of a latch which causes the automatic stopping of the carriage.

The device comprises a suitable table 10 supported, at a convenient height for the operator to manipulate it, on suitable legs 11. On the table are arranged the bearings 12 sliding in ways 13 and adapted to be slid forward by the screw 14, operated by the handle 15 of a suitable ratchet, so that the grinding Wheel or stone 16, on the end of the shaft 17 in the bearings 12, can be advanced as it is worn away by the grinding. The circular face of the grinding wheel is used for the grinding, and the means for holding and conveying the blade across the face of the wheel, with its supporting means, will now be described. It comprises a housing 18 in which is arranged, preferably by a dove-tailed sliding connection, a slide-plate 19 arranged to slide in the housing, having arranged thereon a swinging- 7 plate 20 pivoted at one end by a suitable bolt or pin 21 to the slide-plate 19. On top of the swinging-plate and pivoted intermediate of its ends on a suitable bolt 22 is a top plate 23. To the top plate is fastened a rod or bar 24 having the bearings 25 on its ends. The bearings 25 contain bolts or screws 26, between which screws is pivoted a rocking bar 27. The rocking bar has a handle 28 pivoted thereon, the handle having a aw 29 on its end which is adapted to clamp the blade 30 to the rocking bar, the rocking bar being provided with suitable raised portions or pins 31 on which it rests. The jaw 29 of the handle 28 is held against the blade by the spring 32, shown more particularly in Fig. 2. The blade is put in place when the carriage is at its limit of movement on the completion of the previous grinding. The treadle 33 is operated to pull the flexible strand 34 which passes over a suitable pulley 35 and is connected, by means of the eye 36, to the slide-plate 19. This pulls the carriage back the proper distance, the distance being regulated by the screw 37 in an arm 38, the end of which screw comes in contact with the edge 39 of the housing 18. This brings the blade in a position where, if it is pressed over against the flat face of the wheel, the edge of the wheel will be up against the shoulder 40, shown particularly in Fig. 3. Up to this point however the blade is-notin engagement with the wheel.

To bring the blade over, the swingingplate 20 is swung on its pivot against the pressure of the spring 41 connected with the slide-plate and the swinging-plate by a lever 42 pivoted at 43 and having a roller 44 to make its swinging easier and to not wear the surface of the swinging-plate unnecessarily. The outer end of the lever 42 serves as a handle, as will be understood. The top plate 23 is carried with the swinging-plate 20 by the action of the spring 45 which connects the swinging-plate and the top plate. The operation of swinging the lever 42 it will be seen brings the blade over against the grinding wheel 16 as shown in Figs. 1 and 2, then the handle 46 is pressed down, and being journaled in the post 47 it raises the rod 48 which has, pivotally secured to its lower end, an arm 49, the other end of which arm is pivoted as at 50 to the sliding-plate 19. The arm 49 has a semi-circular recessed portion 51 which is screw-threaded, and when the handle 46 is operated and the rod 48 is raised the screw-threaded portion 51 meshes with the threads of a screw 52 which is journaled in the two ends of the housing, and its projecting end is provided with a pulley 53 run by a suitable belt 54. As soon as this connection of the arm with the screw is accomplished, the carriage is operated toward the front of the machine so that the blade is ground toward its point. The rod 48 is held in its raised position by means of a latch 55 pulled against the rod by a spring 56 and enters a notch 57 in the rod to hold the rod raised against the weight of the arm 51 and the rod 48 itself. After the carriage has traveled far enough so that the blade clears the end of the wheel, the lever or handle 42 comes in contact with a stop 57 which is slotted at 58 and held in its adjusted position by a suitable bolt 59. WVhen this lever 42 is swung around the spring 41 pulls the swinging-plate over to the position shown in Fig. 7 and the grinding ceases. It will be understood that the grinding wheel is continuously rotated.

After the blade has been withdrawn from the grinding wheel the carriage still proceeds until the end of the blade is clear of the wheels periphery, and then the latch 55 engages a stop 60 which is provided with a slot 61 in which fits the adjusting bolt 62. This pulls the latch 55 against the action of the spring 56 and pulls the latch from the slot 57 in the post 48 which allows the arm 49 to drop and disengage the screwthreaded portion 51 from the screw 52, then the handle 28 is operated, the blade 30 is removed, another blade inserted and the operation is repeated.

Attached to the top plate 23 is a bracket 63 which has a roller 64 therein, which roller is adapted to engage with an adjustable shifting plate 65 having slots 66 therein and having the bolts 67 to adjustably secure it to a suitable platform 68. When this shifting plate 65 is adjusted so as to be out of the path of the roller 64, the grinding along the blade is continuous and parallel for the full length of the blade, but when the shifting plate is moved out in the path of the roller, the roller engages as shown in Fig. 6, and causes the top plate to swing on its pivot 22 and make an angular grind on the end of the blade to taper it as shown in Fig. 8. It is understood that these machines are made in right and left hand machines so that in one machine one side of the blade is ground, then the blade is put into the other machine and the other side is ground.

To secure the rocking of the blade the rocking bar 27, to which it is fastened, is provided with an arm 69 which rests and slides along an arm 70 which is fastened to a block 71 which in turn slides in a standard 72. The block is reciprocated by a link 73 reciprocated by a suitable crank 74 on a shaft 75, which shaft is operated by a pulley 76 which is in turn operated by a belt 77 driven from any suitable source of power. It will thus be seen that while the carriage is traveling and drawing the blade across the grinding wheel, the block is reciprocating and causing the bar 69 to give a slight, continuous tilting motion to the rocking bar 27. The upward movement is caused by the reciprocating block, and a spring 78 bears down on the bar 69 to cause the downward movement of the bar, making the rocking of the rocking bar assured. A spring 7 9 is fastened to the bottom of the bar 69 and rests on the arm 70 to give the rocking a little more flexibility and simulate as much as possible the easy twisting that is given to a blade when hand grinding is being done.

This machine is compact and is adapted to grind any kind of blade whether knife, shear or other blade, and the shifting plate 65 can be adjusted to make either an abrupt or an easy tapering point to the blade, as will be understood.

Having thus described our invention, what we claim is 1. A grinding machine comprising a grinding wheel, a carriage, means on the carriage for holding the blade in rocking relation to the grinding wheel, means for propelling the carriage along the face of the grinding wheel, means for normally withdrawing the holding means from the grinding wheel, means for forcing the holding means toward the grinding wheel, automatic means for releasing the forcing means to permit the holding means to be withdrawn from the grinding wheel, and means for rocking the holding means, while the blade is being drawn across the grinding wheel.

2. A grinding machine comprising a grinding wheel, a carriage adapted to travel across the flat face of the grinding wheel, means for propelling the carriage in one direction, automatic means for disengaging the propelling means, manually operated means for causing the engagement of the propelling means, manually operated means for withdrawing the carriage when the ropelling means is disconnected, means mounted 011 the carriage for holding a blade in rocking relation to the grinding wheel, and means for rocking the holding means.

3. A grinding machine comprising a grinding wheel, a carriage adapted to travel across the flat face of the grinding wheel, means for propelling the carriage in one direction, automatic means for disengaging the propelling means, manually operated means for causing the engagement of the propelling means, manually operated means for withdrawing the carriage when the propelling means is disconnected, means mounted on the carriage for holding a blade in rocking relation to the grinding wheel, means for rocking the holding means, and means for forcing the holding means toward and from the grinding wheel.

at. A grinding machine comprising a grinding wheel, a carriage adapted to travel across the flat face of the grinding wheel, means for propelling the carriage in one direction, automatic means for disengaging the propelling means, manually operated means for causing the engagement of the propelling means, manually operated means for withdrawing the carriage when the propelling means is disconnected, means mounted on the carriage for holding a blade in rocking relation to the grinding wheel, means for rocking the holding means, means tending to continually withdraw the holding means from the grinding wheel, means for forcing the holding means toward the grinding wheel, and an automatic stop for releasing the means for forcing the holding means toward the grinding wheel so that the withdrawing means can act.

5. A grinding machine comprising a grinding wheel, a carriage, means for propelling the carriage, a top plate arranged to swing on the carriage, means on the top plate for holding a blade, a shifting plate, and means on the top plate for engaging the shifting plate as the carriage proceeds whereby the top plate can be swung to vary the angle of the blade to the griding wheel,

while the blade is being drawn across the grinding wheel.

6. A grinding machine comprising a grinding wheel, a carriage, means for pro pelling the carriage, a top plate arranged to swing on the carriage, means on the top plate for holding a blade, a shifting plate, means on the top plate for engaging the shifting plate as the carriage proceeds whereby the top plate can be swung to vary the angle of the blade to the grinding wheel, and means for rocking the holding means, while the blade is being drawn across the grinding wheel.

7. A grinding machine comprising a grinding wheel, a carriage, means for pro pelling the carriage, a swinging plate on the carriage, a top plate pivoted in swinging relation to the swinging plate, means tending to normally hold the swinging plate and the top plate in normal parallel relation, means tending to swing the swinging plate on the carriage and from the grinding wheel, manually operated means for forcing the swinging plate toward the grinding wheel, a stop for automatically releasing the last mentioned means, means for holding a blade on the top plate, and means for rocking the holding means, while the blade is being drawn across the grinding wheel.

8. A grinding machine comprising a grinding wheel, a carriage, means for propelling the carriage, a swinging plate pivotally secured near one end to the carriage, a top plate pivotally secured near its center to the swinging plate, a rocking arm secured to the top plate, means on the rocking arm for detachably securing a blade thereto, a spring tending to normally draw the swinging plate from the grinding wheel, a spring to normally force the top plate in line with the swinging plate, manually operated means for forcing the swinging plate, toward the grinding wheel, an automatic stop for releasing the last mentioned means, and means for rocking the rocking bar.

9. A grinding machine comprising a grinding wheel, a carriage, means for propelling the carriage, a swinging plate pivotally secured near one end to the carriage, a top plate pivotally secured near its center to the swinging plate, a rocking arm secured to the top plate, means on the rocking arm for detachably securing a blade thereto, a spring tending to normally draw the swinging plate from the grinding wheel, a spring to normally force the top plate in line with the swinging plate, manually operated means for forcing the swinging plate toward the grinding wheel, an automatic stop for releasing the last mentioned means, means for rocking the rocking bar, a shifting plate, and means for adjustably securing the shifting plate so that it will engage the top plate when the carriage is propelled to vary the angle of the blade to the grinding wheel.

10. A grinding machine comprising a grinding wheel, a carriage, a swinging plate pivoted near one of its ends to the carriage, a top plate pivoted near its center to swing on the swinging plate, a rocking bar on the top plate, means on the rocking bar for detachably securing a blade thereto, means for normally holding the swinging plate and the top plate in line, means tending to normally withdraw the swinging plate from the grinding wheel, manually operated means for forcing the swinging plate toward the grinding wheel, a stop for releasing the last mentioned means, a propelling means for the carriage, manually operated means for throwing the propelling means in operative engagement with the carriage, an automatic means for releasing the carriage from the propelling means, and means for rocking the bar on which the blade is secured.

11. A grinding machine comprising a grinding wheel, a carriage, means for propelling the carriage, manually operated means for connecting the carriage with the propelling means, automatic means for releasing the carriage from the propelling means, manually operated means for withdrawing the carriage when the propelling means has been disconnected from the carriage, a top plate secured to the carriage and arranged to swing thereon, means for holding a blade on the top plate, and means for rocking the holding means.

12. A grinding machine comprising a grinding wheel, a carriage, propelling means for the carriage, manually operated means for connecting the propelling means with the carriage, automatic means for disconnecting the propelling means from the carriage, a top plate arranged to swing on the carriage, a holding means for a blade on the top plate, means for rocking the holding means, a shifting plate, and means for adjusting the shifting plate so that itcan engage the top plate as the carriage is propelled to swing the top plate and vary the angle of the blade to the grinding wheel.

13. A grinding machine comprising a grinding Wheel, a carriage, means for propelling the carriage, a housing for supporting the carriage, a screw operated in the housing, an arm pivotally secured to the carriage, a rod for swinging the arm, means for operating the rod, a latch for holding the rod in its operated position, a screwthreaded portion in the arm for engaging the screw-threads of the screw whereby the carriage is propelled, astop on the housing for actuating the latch to release the rod to permit the dropping of the arm, means on the carriage for holding a blade, and means for rocking the holding means.

14;. A grinding machine comprising a grinding wheel, a housing, a carriage arranged to slide in the housing, a screw in the housing, means for rotating the screw, an arm pivoted to the carriage and having a screw-threaded portion to be thrown in and out of engagement with the screw, a post on the end of the arm to operate the arm, a handle for operating the rod, a latch for holding the arm in its elevated position, an adjustable stop for releasing the latch, a swinging plate on the carriage, a top plate arranged to swing on the swinging plate, means on the top plate for holding a blade, and means for rocking the holding means.

15. A grinding machine comprising a grinding wheel, a housing, a carriage arranged to slide in the housing, a screw in the housing, means for rotating the screw,

an arm pivoted to the carriage and having a screw-threaded portion to be thrown in and out of engagement with the screw, a post on the end of the arm to operate the arm, a handle for operating the rod, a latch for holding the arm in its elevated position, an adjustable stop for releasing the latch, a swinging plate on the carriage, a top plate arranged to swing on the swinging plate, means on the top plate for holding a blade, a projecting element on the top plate, a shiftlng plate, and means for adjusting the shifting plate whereby it can be arranged in the path of the projecting element on the top plate to cause the top plate to swing as the carriage is propelled to vary the angle of the blade to the grinding wheel.

16. A. grinding machine comprising a grinding wheel, a housing, a carriage arranged to slide in the housing, a screw in the housing, means for connecting and disconnecting the carriage with the screw, manually operated means for withdrawing the carriage when the carriage is disconnected from the screw, a top plate secured to the carriage, means for forcing the top plate toward the grinding wheel, means for withdrawing the top plate from the grinding wheel when the forcing means is released, means for varying the angle of the blade to the grinding wheel when the carriage is propelled, holding means on the carriage for the blade, and means for rocking the holding means for the blade.

17. A grinding machine comprising a grinding wheel, a carriage arranged to slide, means for propelling the carriage, means for disconnecting the carriage from the propelling means and returning it to its starting point, a bar secured to the carriage in rocking relation thereto, a pivoted handle having a jaw on its end, the jaw being adapted to hold a blade against the bar, an arm projecting from the bar, and mechanically operated means for rocking the projecting bar for the whole travel of the carriage.

18. A grinding machine comprising a grinding wheel, a carriage arranged to slide, means for propelling the carriage in one direction, means for releasing the carriage from the propelling means, the carriage being adapted to be manually slid back to its starting point, a bar arranged on the carriage, a handle pivoted to the bar and having a jaw to engage a blade to hold the blade against the bar, the bar being adapted to rock, an arm projecting from the bar, a standard, a block sliding in the standard, an arm projecting from the standard on which the arm of the bar is adapted to rest, and means for reciprocating the block whereby the arm with the blade is rocked.

19. A grinding machine comprising a grinding wheel, a carriage, a housing in which the carriage is arranged to slide, means for propelling the carriage, means for returning the carriage to its starting point, a swinging plate pivoted near one end to the carriage, a top plate pivoted near its center to the swinging plate, a bar secured at its ends to the top plate, a spring connecting the top plate and the swinging plate to hold them in parallel relation, a spring from the swinging plate to the carriage to normally draw the top plate and the swinging plate from the grinding wheel, a pivoted handle arranged to bear on its inner end on the swinging plate to force the swinging plate toward the grinding wheel, and an adjustable stop to engage the handle to trip it.

20. A grinding machine comprising a grinding wheel, a housing, a carriage to slide in the housing, a swinging plate pivoted at one end to the carriage, a top plate pivoted near its center to the swinging plate, a spring having one end secured to the top plate and the other end secured to the swinging plate, the second spring having one end secured to the swinging plate and having the other end secured to the carriage, a handle pivoted to the carriage and having its inner end adapted to engage a swinging plate to force it toward the grinding wheel, an adjustable stop to engage the handle to trip it, a bar pivoted on its ends to the top plate, an arm projecting from the bar, means on the bar for securing a blade to the bar, a standard, a block sliding in the standard, an arm substantially parallel with the travel of the carriage and supporting the free end of the arm projecting from the rocking bar, a spring on the top plate and adapted to bear on the arm projecting. from the rocking bar, and means for reciprocating the block in the standard.

21. A grinding machine comprising a grinding wheel, a housing, a carriage to slide in the housing, a swinging plate pivot-ed at one end to the carriage, a top plate pivoted near its center to the swinging plate, a spring having one end secured to the top plate and the other end secured to the swinging plate, the second spring having one end secured to the swinging plate and having the other end secured to the carriage, a handle pivoted to the carriage and having its inner end adapted to engage a swinging plate to force it toward the grinding wheel, an adjustable stop to engage the handle to trip it, a bar pivoted on its ends to the top plate, an arm projecting from the bar, means on the bar for securing a blade to the bar, a standard, a block sliding in the standard, an arm substantially parallel with the travel of the carriage and supporting the free end of the arm projecting from the rocking bar, a spring on the top plate and adapted to bear on the arm projecting from the rocking bar, means for reciprocating the block in the standard, a shifting plate adjustably secured on the housing, and a projecting element to engage the shifting plate to vary the angle of the top plate to the grinding wheel.

22. A grinding machine comprising a bearing having a shaft therein, a grinding wheel on the shaft, a carriage adapted to slide at right-angles to the shaft of the grinding wheel, a holding means on the carriage for holding a blade against the grinding wheel at right-angles to the shaft, and means for rocking the holding means, while the blade is being drawn across the grinding wheel.

In testimony, that we claim the foregoing, we have hereunto set our hands this 21st day of October 1909.

RUDOLF WOLF. ALFRED F. BANNISTER.

Witnesses:

WM. H. CAMFIELD, E. A. PELL. 

